JP2005026557A - Shield wiring member and its shielding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield wiring member and its shielding method capable of suppressing the generation of noise, securing conductivity without the use of a conductive bonding agent or an adhesive, and reducing electromagnetic radiation by improving the shape of a closing part of a conductive sheet. <P>SOLUTION: In the shield wiring member made flat by covering a plurality of coated conducting wires 2a, 2b with the conductive sheet 1, one edge 3a of the closing part 3 of the conductive sheet 1 is wound with the other edge 3b, and both edges are folded and bonded or adhesively fixed by pressure welding. Further, the closing part 3 of the conductive sheet 1 is pierced continuously in a perforated line by sharp protrusions, and bonded or adhesively fixed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wiring member used for wiring of various electronic devices having a movable part such as a liquid crystal display device of a notebook personal computer, and more particularly to a wiring member that is electromagnetically shielded.
[0002]
[Prior art]
With the development of information communication, various information devices and electronic devices are used in many fields. Unwanted radiation radiated from these devices adversely affects other devices, and there are problems such as malfunctions caused by electromagnetic waves entering these devices from the outside. In general, various regulations and countermeasures have been taken for noise as a problem for a long time, but with the recent acceleration of digitization of information, downsizing of electronic equipment, weight reduction, etc., further reliability Is required.
[0003]
As a countermeasure against noise that leads to malfunctions, functional failures, and performance degradation of electronic devices, there is a method of shielding the entire device by using a metal object on the wall surface of the casing of the electronic device. This method increases the amount of components used in the equipment to increase the price and increases the weight, thereby reducing the size and weight and reducing the commercial value. Furthermore, depending on the shape and dimensions, there are problems such as exhibiting an antenna action and failing to make a reliable ground connection.
[0004]
In addition, noise resistance is also ensured by using a braided shielded electric wire, a shielded electric wire wound with aluminum tape, or the like according to the circuit configuration of the in-device wiring. In this method, the outer diameter of the shielded electric wire is increased, and it is necessary to design the shielded electric wire for the design change each time. Therefore, the price is increased and the change is not easy.
[0005]
In addition, in the in-device wiring, a plurality of signal lines and power lines are bundled and bent according to a wiring pattern and have a predetermined length, and an electric connection member such as an electric connector is connected to an end of the wiring member (wire harness). It is also said that) This wire harness may be composed of a flexible printed circuit board using a flexible substrate for the wiring part having a movable part like a notebook personal computer. It may be configured to be integrated and to have a function like a flexible flat cable.
[0006]
In the case where such a wire harness is provided with a shielding function, it is known to shield a printed circuit conductor or an insulated wire by covering with a conductive sheet (see, for example, Patent Document 1). In addition, various types of conductive sheets are known as the conductive sheet. For example, the surface of a synthetic resin fiber such as nylon or polyester is coated with a fiber coated with a conductive metal such as silver or copper. It is also known to form in a sheet shape such as a shape, a honeycomb shape, a fabric shape, and a non-woven fabric (for example, see Patent Document 2).
[0007]
[Patent Document 1]
JP 2001-167642 A [Patent Document 2]
Japanese Patent Laid-Open No. 2000-233463
[Problems to be solved by the invention]
FIG. 4 is a diagram showing an example in which a conventional wire harness composed of a plurality of signal lines and power supply lines is shielded with a conductive sheet. 4 (A) and 4 (B) are cross-sectional views, FIG. 4 (C) is a perspective view of the end portion, in which 1 is a conductive sheet (or conductive tape), 1a is an adhesive or pressure-sensitive adhesive layer, 2a is a single core wire, 2b is a twisted wire, 3 is a closed portion, 3a and 3b are edge portions, 3c is a bonding portion, and 4 is an electrical connector.
[0009]
As shown in FIG. 4, the shield shape of the wire harness H is usually two conductive tapes in which a plurality of single core wires 2a and twist wires 2b are arranged in parallel, and both sides of the core wires are taped. It covers or the conductive sheet 1 is folded and covered. The conductive sheet 1 or tape is a laminated sheet of a highly conductive metal foil such as copper or aluminum and an insulating film provided with an adhesive or pressure-sensitive adhesive layer, or a woven fabric as shown in Patent Documents 1 and 2 above. In addition, a non-woven fabric obtained by imparting conductivity and applying an adhesive or a pressure-sensitive adhesive is used. The conductive sheet 1 or the closed portion 3 of the conductive tape is formed by applying an adhesive or a pressure-sensitive adhesive to the entire inner surface of the conductive sheet 1 or the edges 3a and 3b, and applying pressure or heating to bond or stick together. Yes. An electrical connection member such as the electrical connector 4 is appropriately connected to a single portion of the plurality of single core wires 2a and twisted wires 2b.
[0010]
The closing part 3 usually has a structure in which the adhesive or adhesive surfaces to which the adhesive or adhesive layer 1a is applied are bonded to each other. In this case, electrical continuity is generated by the unevenness of the bonding portion 3c of the conductive sheet 1, but depending on the state of bonding, an adhesive or pressure-sensitive adhesive layer 1a is interposed in the bonding portion 3c. Insufficient electrical continuity may cause noise outside the specified value. In some cases, conductive adhesives or pressure-sensitive adhesives are used, but the use of conductive adhesives or pressure-sensitive adhesives is troublesome in terms of management, such as coating and drying, resulting in poor workability and high cost. It becomes.
[0011]
The present invention has been made in view of the above-described circumstances, and by improving the shape of the closed portion of the conductive sheet, electromagnetic radiation is reduced, and conductivity can be achieved without using a conductive adhesive or pressure-sensitive adhesive. It is an object of the present invention to provide a shield wiring member that secures and suppresses noise generation and a shielding method thereof.
[0012]
[Means for Solving the Problems]
The shield wiring member according to the present invention is a shield wiring member formed by covering a plurality of covered electric wires with a conductive sheet and flattened, and one edge of the conductive sheet joining portion is wound around the other edge. Fold it up and fix it with adhesive or adhesive.
Further, another shield wiring member according to the present invention is a shield wiring member in which a plurality of covered electric wires are covered with a conductive sheet and made flat, and the conductive sheet joint portion is perforated by sharp protrusions. Stick continuously or stick or fix.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram for explaining the adhesion or adhesion shape of the closed portion of the conductive sheet, FIG. 2 is a diagram for explaining the adhesion or adhesion method of the closure portion, and FIG. 3 is a diagram for explaining an example of a wire harness. In the figure, 1 is a conductive sheet (or conductive tape), 1a is an adhesive or adhesive layer, 2a is a single core wire, 2b is a twisted wire, 3 is a closed portion, 3a and 3b are edges, and 3c is bonded together , 4 is an electrical connector, 5 is a fold adhesion or adhesive part, 6 is a piercing contact part, 7 is a pressing roller, 7a is a pressing surface, 8 is a piercing roller, and 8a is a piercing piece.
[0014]
The shield wiring member according to the present invention is formed by arranging a plurality of single-core wires 2a and twisted wires 2b, which are coated with an insulation coating, in parallel as in the prior art and covering the outer surface with the conductive sheet 1. The shield wiring member may be configured as a flat cable simply covering a plurality of signal lines and power lines, or may be configured as a wire harness described later. Moreover, the electroconductive sheet 1 is used in the form of a long tape according to the application object or a sheet cut out to an appropriate shape.
[0015]
As the conductive sheet 1, those having various configurations can be used, but those obtained by imparting conductivity to a woven fabric or a nonwoven fabric disclosed in Patent Documents 1 and 2 are preferable. Specifically, it is desirable that the surface of a synthetic resin fiber such as nylon or tetron is plated with two layers of metal such as copper and tin or nickel and woven in various forms. It is assumed that an adhesive or a pressure-sensitive adhesive is applied or impregnated on one surface side of the conductive sheet 1 on the entire surface or at least a portion that becomes the closed portion 3. The adhesive or pressure-sensitive adhesive is desirably a pressure-sensitive one that exhibits adhesion or tackiness by pressure, or that adheres or sticks by heating and pressure.
[0016]
As shown in FIG. 1 (A), the conductive sheet 1 is folded by one sheet, and is closed by one closing portion 3 with the single core wires 2a and the twisted wires 2b arranged in parallel, or As shown in FIG. 1B, two sheets can be used by closing the single core wire 2a and the twisted wire 2b with the two closing portions 3 therebetween. 1 (A) and 1 (B), the closed portion 3 of one of the edges 3a is wound around the other edge portion 3b to close the bonding or sticking portion 3c between the adhesive surfaces, and the edge portion 3b is closed to the edge portion. Folding is performed on the outer surface of 3a to form a folded adhesive or adhesive portion 5, and the adhesive or adhesive is integrated so as to partially overlap the three layers. It is preferable that the width of the fold-bonding adhesion or the adhesion part 5 between the edge part 3a and the edge part 3b is at least 0.5 mm or more.
[0017]
By making the shape of the closing portion 3 as described above, one edge portion 3a is surrounded by being wound around the other edge portion 3b, and the bonding portion 3c is prevented from being opened by an adhesive or pressure-sensitive adhesive layer. be able to. Thereby, it is considered that electromagnetic radiation to the outside from the bonded portion 3c is difficult to be performed, and the shielding function is enhanced.
[0018]
In the example of FIG. 1 (C), the closed portion 3 is bonded together so that one edge 3a and the other edge 3b are bonded or adhered to each other in the same manner as in the past. A needle-like piercing piece 8a is pierced from the outside into the bonding portion 3c, and a piercing contact portion 6 is formed by the protrusion formed thereby. The pitch of the piercing is about 1 mm to 5 mm, and it is preferable to form it in a perforated shape. By piercing the piercing piece 8a at a predetermined pitch, the edge portion 3a and the edge portion 3b are pressed against each other to be bonded or adhesively integrated. Good.
[0019]
By making the shape of the closing portion 3 as described above, the edge portion 3b of one sheet pierced by the piercing piece 8a is perforated as shown in the partial enlarged view of FIG. The protrusion generated by the perforation breaks through the adhesion or pressure-sensitive adhesive layer of the bonding portion 3c and makes electrical contact with the edge 3a of the other sheet, whereby the piercing contact portion 6 is formed and the bonding portion 3c conducts. It is thought that it is improving the nature. As the puncture pitch is smaller, the shielding function is improved. However, if the piercing pitch is too small, there is a fear of cutting, and if it is too large, the shielding effect is reduced.
[0020]
The example of FIG. 1D is a combination of the configurations of FIG. 1A and FIG. In this case, the closing portion 3 is formed by laminating one edge portion 3a at the other edge portion 3b to form a folded adhesive or adhesive portion 5 and bonding them together, and a needle-like piercing piece from the outside to the bonding portion The contact portion 6 is formed by piercing 8a and piercing with the protrusion 8a. With this configuration, the bonding portion 3c is prevented from being opened by the adhesive or the adhesive layer, electromagnetic radiation from the bonding portion 3c to the outside is suppressed, and the conductivity of the bonding portion 3c is ensured. Thus, the shielding effect can be further enhanced.
[0021]
FIG. 2A is an example of producing a shield wiring member having the shape shown in FIGS. The closed portion 3 of the conductive sheet 1 is wound around one edge portion 3a with the other edge portion 3b, closes the bonding portion 3c between the adhesive or adhesive surfaces, and folds the edge portion 3b on the outer surface of the edge portion 3a. Then, the folded adhesive or adhesive portion 5 is formed. The closing part 3 is adhered or adhered and integrated by, for example, applying a pressing roller 7 as shown in the drawing along the closing part 3 from the outer side of the outermost edge part 3b and pressing with the pressing surface 7a. Further, when it is necessary to heat and press the adhesion or adhesion, a heating roller may be used.
[0022]
FIG. 2B is an example of manufacturing a shield wiring member having the shape shown in FIG. The closing portion 3 of the conductive sheet 1 bonds the adhesive or adhesive surfaces of one edge 3a and the other edge 3b. Then, along the closing portion 3, the piercing roller 8 provided with a number of sharp piercing pieces 8a at a predetermined pitch on the outer periphery is applied, and the piercing pieces 8a are bonded to each other by opening a perforation. The contact portion 6 is pierced into the portion 3c, and the closed portion 3 is bonded or adhesively integrated. In addition, a method of forming a perforation using a normal sewing machine can also be used. In addition, you may strengthen adhesion | attachment or adhesion | attachment with the press-contact roller 7 of FIG. 2 (A) separately.
[0023]
The wire harness shown in FIG. 3 has the same shape as the conventional one, and a plurality of single core wires 2a and twisted wires 2b are arranged in parallel to form a flat shape, cut into a predetermined length, and the end portion thereof. An electrical connecting member such as the electrical connector 4 is connected. As the single-core wire 2a and the twisted wire 2b, for example, an insulated wire excellent in flexibility having a coated outer diameter of about 0.6 mm in which seven 0.1 mmφ copper and aluminum wires are twisted is used. In addition, the wire harness is configured to partially cover the core wire with a conductive sheet 1 ′ rounded into a cylindrical shape in order to partially provide a branch path in a part of the wire harness or to be accommodated in a movable part. can do. And the closing part 3 of the electroconductive sheet 1 is provided with a stable shielding function without variation by being bonded or adhesively integrated by using the winding and folding structure shown in FIG. 1 or the contact structure with perforations. Wire harness.
[0024]
【The invention's effect】
As described above, according to the present invention, the electromagnetic radiation can be reduced by a simple shape in which the closed portion of the conductive sheet is folded and wrapped around one edge, and the conductive sheet can be conductive by simply perforating. The generation of noise can be effectively reduced by ensuring the conductivity without using an adhesive or pressure sensitive adhesive.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an embodiment of the present invention.
FIG. 2 is a diagram illustrating an example of a method for producing a shield wiring member according to the present invention.
FIG. 3 is a view for explaining an example of a shield wiring member (wire harness) according to the present invention.
FIG. 4 is a diagram illustrating a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,1 '... Conductive sheet (or conductive tape), 1a ... Adhesive or adhesive layer, 2a ... Single core wire, 2b ... Twist wire, 3 ... Close part, 3a, 3b ... Edge part, 3c ... Lamination 4 is an electrical connector, 5 is a fold-bonded or adhesive part, 6 is a stab contact part, 7 is a pressure roller, 7a is a pressure contact surface, 8 is a stab roller, and 8a is a stab piece.

Claims (7)

A shield wiring member in which a plurality of covered electric wires are covered with a conductive sheet and flattened, and the closed portion of the conductive sheet is wound around one edge at the other edge and folded or bonded. A shield wiring member characterized by being adhesively fixed. A shield wiring member in which a plurality of covered electric wires are covered with a conductive sheet and flattened, and the bonded portion of the closed portion of the conductive sheet is continuously pierced in a perforated shape by sharp protrusions. A shielded wiring member that is bonded or adhesively fixed. A shield wiring member in which a plurality of covered electric wires are covered with a conductive sheet and flattened, and the closed portion of the conductive sheet is folded by folding one edge around the other edge. A shield wiring member, wherein a folded portion is continuously pierced in a perforated shape by a sharp protrusion and is adhered or adhered and fixed. The conductive sheet is formed of a woven or non-woven fabric of synthetic resin fiber in which the surface of the synthetic resin fiber is coated with a conductive metal, and an adhesive or a pressure-sensitive adhesive is applied to at least a bonded portion. The shield wiring member according to claim 1. 5. The shield wiring member according to claim 1, wherein an electrical connection member is connected to end portions of the plurality of covered electric wires. A method for shielding a wiring member that electromagnetically shields a plurality of covered electric wires by covering them with a conductive sheet, and wraps one edge of the closed portion of the conductive sheet at the other edge. A method of shielding a wiring member, characterized in that the folded portion is pressed and bonded or adhesively fixed by pressing the folded portion. A method of shielding a wiring member in which a plurality of covered electric wires are covered with a conductive sheet and are electromagnetically shielded to form a flat shape, and the bonded portion of the closed portion of the conductive sheet is continuously perforated by sharp projections. A method for shielding a wiring member, characterized in that the wiring member is stuck and bonded or adhesively fixed.

Images